This is the method to obtain Seal Stone Cube(+1) for free!
1. Tap the setting button
2. Scroll down until the end of the page
3. Tap the coupon button
2. Choose the HAPPY LUCKY CODE COUNTDOWN 2016
3. Type TRICIAFLY
4. Finally, tap the submit button
5. You will see your Seal Stone Cube(+1) in the mailbox
ONLY WORKS ON SUNDAY, 27 DECEMBER 2015